Chipotle celebrates five years of the $3 ‘boo-rrito' with a twist

This weekend, creative ghouls and ghosts can score a discounted burrito at Chipotle.

It’s the chain’s 5th annual “Boo-rrito” event where customers in costume can cop a $3 meal with all the fixings. But this year, Chipotle is changing things up a bit to support their latest campaign, which highlights the its stance against using unnecessary additives and preservatives.

Earlier this month, Chipotle released a spot featuring the fictitious “Cheapotle” — an additive-filled rip-off of the Mexican Grill-- that tries to serve a customer a chicken rice bowl with additives like disodium guanylate and disodium inosinate.

This year, customers who dress up on the 31st will be required to “add something unnecessary” to their getup to really drive the message home. Examples include a “Bearded Fairy,” a mummy wearing roller skates or Marilyn Monroe-alien hybrid—but the possibilities are endless. The promotion runs tomorrow Oct. 31, from 5 p.m. local time to close. The chain will donate up to $1 million to the Chipotle Cultivate Foundation during the promotion.